The target strength or acoustic size is a measure of the reflection coefficient of a sonar target. This is usually quantified as a number of negative decibels. For fish such as salmon, the target size varies with the length of the fish and a 5 cm fish would have a target size of about -50 db.
- J.E. Ehrenberg (1989), "A review of target estimation techniques", Underwater Acoustic Data Processing, Springer
Further reading 
- "Introduction to the use of sonar systems for estimating fish biomass, FAO Fisheries Technical Paper No. 191, Revision 1, FAO 1982"
- Fisheries Acoustics Simmonds, E John and MacLennan, David N (2005) Blackwell Publishing. ISBN 978-0-632-05994-2
- C. S. Clay & H. Medwin, Acoustical Oceanography (Wiley, New York, 1977)
|This physics-related article is a stub. You can help Wikipedia by expanding it.|